From: Chris Metcalf <cmetcalf@tilera.com>
Date: Thu, 29 Mar 2012 19:59:11 +0000 (-0400)
Subject: arch/tile: implement panic_smp_self_stop()
X-Git-Tag: next-20120402~50^2~20
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0f1581229866cef0006e759bc0b7d824fb362ec2;p=karo-tx-linux.git

arch/tile: implement panic_smp_self_stop()

This allows the later-panicking tiles to wait in a lower power state
until they get interrupted with an smp_send_stop().

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
---

diff --git a/arch/tile/kernel/smp.c b/arch/tile/kernel/smp.c
index f86887aebaad..5b46a125a65d 100644
--- a/arch/tile/kernel/smp.c
+++ b/arch/tile/kernel/smp.c
@@ -132,6 +132,12 @@ void smp_send_stop(void)
 	send_IPI_allbutself(MSG_TAG_STOP_CPU);
 }
 
+/* On panic, just wait; we may get an smp_send_stop() later on. */
+void panic_smp_self_stop(void)
+{
+	while (1)
+		asm("nap; nop");
+}
 
 /*
  * Dispatch code called from hv_message_intr() for HV_MSG_TILE hv messages.